Consider a one-time pad where the ciphertext, plaintext and key are all strings from A, ... Z (the 26 alphabet characters). The encryption function is E _Ki (Pi) = P _i + K _i (mod 26) where P _i, K _i are the i^th characters of the plaintext P and key K respectively. In this case the key is K = k _1, k _2 k _...k _n a randomly chosen string of alphabet characters and n is the length of the message. Assume that the plaintext is SECURITY and the key is BGPLKMXS. Give the ciphertext created with a one-time pad. From the ciphertext that you computed in part a., give a different plaintext and key that would create the same ciphertext using a one-time pad as above